Oxford Baby Dreams Cool Gel Foam 2 Stage Dual Sided Crib and Toddler Mattress. Oxford Baby Dreams Crib Mattress is top of the line Dual Stage Crib and Toddler Mattress with Cool Gel Foam from Oxford Baby. This Mattress has a stretch Derma Waterproof Cover. The Mattress consists of three distinctive layers of foam. The Toddler side's top layer of Cool Gel foam makes the mattress more breathable and cool. The Cool Gel draws heat away from the child's body, creating a cooler sleep surface, which prevents tossing and turning, making for a more restful night's sleep. The middle layer of foam is made with a wave core foam which promotes air circulation. Finally the infant side of this dual stage mattress is made with a firm foam which is recommended by the American Academy of Pediatrics (AAP). The three different foam layers used in the Dreams Dual Stage Mattress are all CertiPUR-US certified. The thickness of this mattress measure a full 6 inch. Baby > Category > Nursery Furniture > Crib & Toddler Mattresses. Furniture > Baby & Toddler Furniture > Crib & Toddler Bed Accessories.